Filament support



July 1 0 1923.

' 1,461,232 s. THRONSEN FILAMENT SUPPORT I Filed Sept. 5 1918 //7ve/1f0/ ya/d 7/7/0/75 6/7. fly

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FILAMENT SUPPORT.

Application filed September 3, i918. Serial at. 252,379.

To allwiwmit may concern:

Be it known that l, SIGURD THnoNsnN, a citizen of the United States, residing at Chicago, in the county of Cook and State of Illinois, have invented certain new and use ful lmprovements'in Filament Supports, of which the following is a full, clear, concise, and exact description.

This invention relates to electron dis charge devices-and has for its object to pro vide a means whereby'the filament therein may at all times he kept under the proper degree of tension to prevent vibration there- .of. This invention is particularly applicahle to electron discharge devices of the audion type where other parts, closely related to the filament, are contained within the evacuated space, and where absencaof vibration is necessary not only to lengthen the life of the filament but as well to maintain the space relation between the filament and the other electrodes, upon the maintenance.

of which depends the proper functioning of the device. I

The invention is illustrated in the drawing which represents an electron discharge device employing my invention. s

As shown, the device comprises a base portion 1 adapted to be inserted in a suitable socket, not shown. To this is attached in evacuated glass container 2. 'lhe usual gllass press orelectrode support 3 is. shown,

om which leading-in wires extend to the various parts. Plate electrodes 4, 5 are shown, the top portions of which are connected and adapted to retain a block 6 of suitable insulating material.

Grids 7 and 8 of suitable mesh are shown and are supported by'wires 9 and 10 extend-' ing from t einsulating block 6. A filament 11 is sliown of any suitable material and 15 supported at its upper end by a wire 12 extending from theunder part of the junction between the upper ends of plate electrodes 4 and 5. The lower ends of the filament 11 are connected to leadin -in' wires 13. and 14 of any suitable materia These wires are bent into suitable shape and form a spring means whereby the tension of the filament is maintained-at the proper degree under all conditions of temperature. The planes 0;

ment.

plates, grids, filament and filament spring supports 13 and 16 are parallel.

Looking at the tube from the right of the figure it will be seen that the left-hand leading-in wire 14, which extends from the glass portion 3 nearer to the left-hand lower end of filament 11, is bent further to the left in the form of a curved bow and then extends to the right and at its other end is connected to the right-hand lower end of the till filament. Similarly, the right-hand leadingin wire 13, which extends from the glam portion 3 nearer to the right-hand lower end of filament 11, is bent further to the right in the form of a curved bow and then extends to the the left and at its other end is confilament is considerably lengthened due to absence of short-circuiting with other electrodes which might be produced by vibration, and that the device functions properly because the space relations, upon which its proper operation depends, are maintained constant. What is claimed is: e

1. An electric device comprising afilament, a rigid support therefor and means to tension said filament comprising a pair of resilient wires, each wire being provided with a return bend portion and having one of its ends connected with said filament.

2. An electric device comprisipg a filament, a rigid support therefor, resilient lead wires for said filament, each lead wire being provided with a return bend portion and having one of its ends connected to said fila- 3. An electric device comprisin an evacuated vessel, a base therefor, a lament, a filament-support arisingfrom said base portion, means to tension t ing a pair of resilient wires arising from said base portion, said wires being provided with approximately opposed bow portions,

the free ends other an lire I 4. An electric 5; rice comprising an evacuated vessei, a base portion therefor, pmrality of elm-trodes comprising a filament therein, a s port for said electrodes arising from said base portion, resilient lead Wires for said fiiazneni arising from said base portiorn said wires having approximately opposed spring bow portions, the free ends of 10 said Wires overlapping each other and being aitaehed to said filament.

in wieness whereof I hereunto subscribe my name this 26th day of August, A. D.

SIGURD THRONSEN. 

